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21. C (Tourism will always have an impact on the places visited. Sometimes the impact is good, but often it is negative....damaging the environment)

22. C (The idea is to encourage ourists to think about what they do when they visit a place)

23. C (Tourists shouldn't drop litter, they should stay on the paths, they shouldn't interfere with wildlife and they should respect local customs and traditions)

24. B avoid: tránh ~ prevent: ngăn cản, ngăn chặn 

25. B (The main aim of ecotourism is to reduce the negative impact that tourism has on the environment and local people)